EP0550401B1 - Procédé pour la gaséification indirecte de liqueurs résiduelles ou noires - Google Patents

Procédé pour la gaséification indirecte de liqueurs résiduelles ou noires Download PDF

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Publication number
EP0550401B1
EP0550401B1 EP19930102400 EP93102400A EP0550401B1 EP 0550401 B1 EP0550401 B1 EP 0550401B1 EP 19930102400 EP19930102400 EP 19930102400 EP 93102400 A EP93102400 A EP 93102400A EP 0550401 B1 EP0550401 B1 EP 0550401B1
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EP
European Patent Office
Prior art keywords
bed
liquor
product gas
reactor
steam
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Expired - Lifetime
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EP19930102400
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German (de)
English (en)
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EP0550401A1 (fr
Inventor
Momtaz Nosshi Mansour
Kanda-Swamy Durai-Swamy
David Walter Warren
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Manufacturing and Technology Conversion International Inc
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Manufacturing and Technology Conversion International Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C15/00—Apparatus in which combustion takes place in pulses influenced by acoustic resonance in a gas mass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01B—BOILING; BOILING APPARATUS ; EVAPORATION; EVAPORATION APPARATUS
    • B01B1/00—Boiling; Boiling apparatus for physical or chemical purposes ; Evaporation in general
    • B01B1/005—Evaporation for physical or chemical purposes; Evaporation apparatus therefor, e.g. evaporation of liquids for gas phase reactions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/1836—Heating and cooling the reactor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
    • B01J8/18—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles
    • B01J8/24—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique
    • B01J8/40—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes with fluidised particles according to "fluidised-bed" technique with fluidised bed subjected to vibrations or pulsations
    • C—CHEMISTRY; METALLURGY
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    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
    • C01B3/38—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts
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    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
    • C01B3/38—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts
    • C01B3/382—Multi-step processes
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    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/32—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air
    • C01B3/34—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents
    • C01B3/38—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts
    • C01B3/42—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts using moving solid particles
    • C01B3/44—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of gaseous or liquid organic compounds with gasifying agents, e.g. water, carbon dioxide, air by reaction of hydrocarbons with gasifying agents using catalysts using moving solid particles using the fluidised bed technique
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/004—Sludge detoxification
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    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
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    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
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    • C10J3/06—Continuous processes
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    • C10J3/48—Apparatus; Plants
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    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
    • C10J3/54—Gasification of granular or pulverulent fuels by the Winkler technique, i.e. by fluidisation
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    • C10J3/00—Production of combustible gases containing carbon monoxide from solid carbonaceous fuels
    • C10J3/46—Gasification of granular or pulverulent flues in suspension
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    • C10J3/56—Apparatus; Plants
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    • C10K—PURIFYING OR MODIFYING THE CHEMICAL COMPOSITION OF COMBUSTIBLE GASES CONTAINING CARBON MONOXIDE
    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/002—Removal of contaminants
    • C10K1/003—Removal of contaminants of acid contaminants, e.g. acid gas removal
    • C10K1/004—Sulfur containing contaminants, e.g. hydrogen sulfide
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    • C10K1/024—Dust removal by filtration
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    • C10K1/026—Dust removal by centrifugal forces
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    • C10K1/00—Purifying combustible gases containing carbon monoxide
    • C10K1/08—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors
    • C10K1/10—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids
    • C10K1/12—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors
    • C10K1/122—Purifying combustible gases containing carbon monoxide by washing with liquids; Reviving the used wash liquors with aqueous liquids alkaline-reacting including the revival of the used wash liquors containing only carbonates, bicarbonates, hydroxides or oxides of alkali-metals (including Mg)
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    • C10K3/00—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide
    • C10K3/02—Modifying the chemical composition of combustible gases containing carbon monoxide to produce an improved fuel, e.g. one of different calorific value, which may be free from carbon monoxide by catalytic treatment
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/12—Combustion of pulp liquors
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/12—Combustion of pulp liquors
    • D21C11/125—Decomposition of the pulp liquors in reducing atmosphere or in the absence of oxidants, i.e. gasification or pyrolysis
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    • B01J2208/00008—Controlling the process
    • B01J2208/00017—Controlling the temperature
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    • C01B2203/0205—Processes for making hydrogen or synthesis gas containing a reforming step
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Definitions

  • This invention relates to indirectly heated thermochemical reactors and processes for performing thermochemical reactions including, for example, black liquor recovery and energy recovery and conversion of renewable resources.
  • thermochemical reactions encompass a wide spectrum of reactions in which feedstocks are directly or indirectly heated to effect desirable endothermic reactions.
  • exothermic reactions effected in-situ provide the heat of reaction for the desired endothermic processes.
  • directly heated systems include partial oxidation and autothermal gasifiers. Although these systems can be used to gasify, for example, carbonaceous material, the product gas is of low quality due to the presence of diluents. i.e., the products of the exothermic reactions.
  • Black liquor the by-product of pulping processes, generally contains biomass-derived lignins and inorganic sodium and, in some instances such as in the case of the Kraft liquor, sulfur process chemicals.
  • the economics of the process dictate the need for recovering the process chemicals and energy values of the black liquor.
  • the Kraft black liquor recovery process for example, must provide a means for conserving and/or regenerating sulfur in the sodium sulfide form. This is currently being accomplished using a Tomlinson recovery furnace, wherein black liquor is combusted and the inorganic sulfate chemicals are reduced by reaction with carbon in a molten smelt bed at the bottom of the furnace.
  • Tomlinson furnace has been widely employed in the Kraft paper industry for several decades, it possesses significant deficiencies, including safety hazards, i.e., smelt-water explosions, corrosion and undesirable environmental emissions.
  • Tomlinson furnaces represent a significant fraction of the total capital expenditure for a modern mill. When mill expansions are contemplated, there exists little opportunity for incremental plant capacity expansion because recovery boilers are economically viable only in large capacities.
  • Patent 3,606,867 refers to a pulsating combustion system for producing a high temperature and pressure gas stream to impinge on objects for heat treatment.
  • U.S. Patent 2,937,500 refers to resonant jet engines in combination with heat exchange equipment, which equipment is characterized by a sonically augmented rate of heat transfer for use in heating the air supply to the engine. None of these patents or any of the aforementioned thermochemical processes suggest the use of pulsating combustion in connection with an indirectly heated fluid bed reactor.
  • the present invention overcomes the deficiencies of the currently used indirectly heated reactors by utilizing a single or, preferably, multiple resonant tube(s) of a pulsating combustor emanating from the same combustion chamber as the in-bed heat exchanger, wherein the velocity and pressure oscillations of the combustion gases and the intense acoustic field radiated by the multiple resonance tubes into the reactor bed enhance rates of heat release, heat and mass transfer and, ultimately, the rates of reaction in the bed.
  • thermochemical reactors characterized by high thermal efficiency, high processing rates, low capital and maintenance cost and high product quality for end-use applications, including black liquor gasification and effecting endothermic reactions in chemical processes for production of desired chemicals.
  • thermochemical indirectly heated reactor apparatus for enhancing rates of heat release, heat and mass transfer, reaction rates and throughput for producing useful products and detoxification of materials with low levels of environmental intrusion, whereby improved thermochemical processes are provided for end-use purposes, including black liquor recovery.
  • the invention has for its object the provision of a process for gasifying black liquor and recovering its energy and chemical values, without molten smelt production.
  • a further aim of the invention is to provide a modular black liquor recovery system and process well-suited for incremental mill capacity expansion.
  • thermochemical reactor apparatus including a fluid-bed reactor which is indirectly heated by a pulse combustor having a combustion chamber, an aerodynamic valve, and single or multiple elongated conduits bounding a resonance zone, having an inlet at the combustion chamber at one end thereof and an outlet at the other end, hereinafter called "resonance tube(s)."
  • the fluid-bed reactor is provided with one or more material introduction ports and is charged with solid particles comprising a suitable bed material which may be inert or may be of catalytic nature providing catalytic enhancement of reactions within the bed.
  • the fluid-bed reactor is also provided with a port near the bottom of the reactor for introduction of a fluidization medium which may be steam, gas, evaporated liquids other than steam or a combination thereof.
  • a fluidization medium which may be steam, gas, evaporated liquids other than steam or a combination thereof.
  • the flow of the fluidization medium within the fluid-bed reactor is distributed in a manner which is substantially uniform over the cross-section of the bed by distribution means for uniform distribution of the fluidization medium.
  • an exit plenum is provided to collect gases exiting the resonance tubes.
  • Solid material, gases and vapors hereinafter called “reactor products,” exit the fluid-bed reactor through a separate port.
  • the reactor products then enter a particulate matter separation means such as a cyclone or baghouse or other suitable means for separation of solids from the reactor products.
  • the operation of the apparatus of the invention involves introducing a fuel and an oxygen-containing gas into a combustion chamber and combusting a first part of the fuel introduced into the combustion chamber under conditions effecting pulse combustion thus producing a hot gaseous stream comprising a remaining part of the fuel introduced into the combustion chamber, the pulse combustion being operable to produce velocity oscillations of at least about 20 Hz in frequency and acoustic dynamic pressure levels of at least about 165 dB.
  • the hot gaseous stream from the combustion chamber is then discharged into an inlet of an elongated resonance zone bounded by a conduit wall having an inlet at one end thereof and an outlet at the other.
  • the remaining part of the fuel in the hot gaseous stream is combusted in the resonance zone thereby further producing heat in a combustion product stream.
  • Heat is transferred from the combustion product stream through the conduit wall surrounding the resonance zone into a bed of solid particles confined in a reaction zone.
  • a fluidizing liquid vapor or gas is injected into and through the reaction zone through a port at a rate operable for maintaining the solid particles in an agitated state.
  • the solid particles in the reaction zone are heated by heat transfer from the combustion product stream in the resonance zone, without direct contact between the combustion product stream and the particles, such that the overall rate of heat transfer from the combustion product stream to the particles is at least about twice as high as that which would be achieved in the absence of pulse combustion.
  • a reactant material is introduced into the reaction zone through one or more ports, mixed with the heated solid particles and fluidizing medium of the bed, and, thus undergoes endothermic reaction or physical change in the bed and is processed to yield useful products.
  • the intense acoustic field radiated into the bed of solid particles in the reaction zone, from the resonance tubes, enhances mixing in the bed and reactant materials charged thereto and increases rates of particle-to-gas and particle-to-vapor mass transport and reactions in the bed, thereby overcoming reaction diffusion limitations and enhancing the effectiveness of reaction kinetics resulting in high process throughput rates.
  • Pulsations in the flow of combustion gases through the resonance tubes impart vigorous mass transfer within the boundary film layer at the interface between the hot combustion gases and the inner conduit wall, thereby eliminating a major cause of heat transfer resistance.
  • the heat transfer rates between the outer wall of the resonance tubes and the material in the reaction zone (fluid-bed) are generally high.
  • the indirectly heated system of this invention has a heat transfer coefficient which is higher by a factor of about 2 to about 10 times the heat transfer coefficients of conventional systems.
  • the size and number of the resonating heat transfer tubes of this invention are relatively small when compared to the size and number of heat exchangers in fire-tube conventional indirectly heated systems.
  • the combustor is also compact due to efficient combustion and high volumetric heat release rate.
  • the pulse combustor of the apparatus of this invention has a heat release rate of about 41.4 x 10 6 to about 62.1 x 10 6 w/m 3 (4,000,000 to about 6,000,000 Btu/ft 3 /hr) or higher, as compared to a heat release rate of 41.1 x 10 4 to about 41.4 x 10 5 w/m 3 (40,000 to 400,000 Btu/ft 3 /hr) for conventional combustors.
  • the pulse combustor has an aerodynamic valve for self-regulation of the fuel to air ratio within the combustor's firing range and produces heat at about 41.4 x 10 6 w/m 3 (4,000,000 Btu/hr/ft 3 ), combustion product gas temperature of about 1922°K (3000°F) gas velocity in the resonance tube of at least about 91m/s (300 ft/sec) with oscillations of at least 165 dB and at least 20 Hz, and radiates an acoustic pressure level of at least about 140-150 dB (as measured in the reaction zone).
  • the intense acoustic field many reactions occur in the reactor of the invention at reaction zone temperatures 311 to 366°K (100° to 200°F) lower than in conventional systems.
  • the fluctuating flow field causes the products of combustion to be swept away from the burning, non-gaseous fuel, thus providing access to oxygen. Diffusion limitations in the pulse combustor and resonance tube are essentially eliminated, reducing the need for excess air.
  • reactors and bed materials can be used in this invention.
  • a fluidized bed reactor or entrained bed reactor, and a fluidizing or carrier gas is used.
  • the reactor of this invention can be used for heating a wide variety of inorganic or organic materials, including, for example, slurries such as black liquor.
  • steam gasification of black liquor is effected with no process air or oxygen and, thus, strictly endothermic reactions occur in the bed.
  • the process of this invention enables black liquor recovery without formation of molten smelt.
  • black liquor of concentration between about 50 to 75 percent solids, is steam atomized or sprayed directly onto hot bed solids in the reaction zone of the reactor.
  • the black liquor forms a relatively thin coating on the surface of the solid particles and is pyrolyzed at a very high rate.
  • This provides a high surface area and porosity for the rapidly pyrolyzing black liquor coating, sufficient for completing steam gasification, sodium sulfates reduction to sodium sulfides in the reactor's reducing environment and release of sulfur-containing hydrocarbons found in the liquor in the form of hydrogen sulfide, with essentially all the sodium in the black liquor reacted to form sodium carbonate, without molten smelt formation.
  • the preferred bed material for this embodiment which material is initially charged in the reaction zone, is sodium carbonate (soda ash).
  • the preferred temperature for the reaction zone is 866 to 950°K (1100°F to 1250°F) with the in-bed heater element surface maintained below a maximum temperature of about 978 to 1005°K (1300°F to 1350°F). This is essential to prevent softening or melting of the sodium carbonate found in the bed which would lead to bed agglomeration and formation of undesirable molten smelt.
  • the recovered sodium compounds which are in the form of sodium carbonate with a small amount of char, are dissolved in water to form an alkaline sodium carbonate solution which is used to scrub the product gas, thus recovering the sulfur and forming green liquor.
  • the green liquor is further processed in the usual manner to provide sodium hydroxide and sulfide (white liquor) for the Kraft pulping process.
  • Traces of hydrogen sulfide which may be present in the product gas after scrubbing the gas with the sodium carbonate solution can be further removed by scrubbing the gas one more time with sodium hydroxide if necessary.
  • the reaction zone contains a bed of sand or calcium carbonate, fluidized with steam. Biomass is injected into the lower portion of the fluid bed. A pulse combustor is fired with fuel injected into a combustion chamber below the bed. Resonant tubes carry the combustion gases through the bed, providing an intense acoustic field and heat for endothermic gasification reactions which take place in the fluid bed.
  • thermochemical apparatus includes a fluid-bed reactor 1 which is indirectly heated by a pulse combustor 2 having a combustion chamber 3, an aerodynamic valve 4, and single or multiple elongated conduits 5, bounding a resonant zone and having an inlet at the combustion chamber at one end thereof and an outlet at the other end.
  • the fluid bed reactor 1 is provided with one or more material introduction ports 6 and is charged with solid particles comprising a suitable bed material 7 which may be inert or may be of catalytic nature providing catalytic enhancement of reactions within the bed.
  • the fluid bed reactor is also provided with a port 8 near the bottom of the reactor for introduction of a fluidization medium which may be steam, gas, evaporated liquids other than steam or a combination thereof.
  • the flow of the fluidization medium within the fluid-bed reactor is distributed in a manner which is substantially uniform over the cross-section of the bed by distribution means 9, which is depicted in the figure as a distributor plate but could be a number of nozzles or tubes having metering holes for the uniform distribution of the fluidization medium.
  • an exit plenum 10 is provided to collect gases exiting the resonance tubes.
  • Reactor products exit the fluid bed reactor through a separate port 11.
  • the reactor products then enter a particulate matter separation means 12, depicted in Figure 1 as a cyclone but could be a baghouse or other suitable means for separation of solids from the reactor products.
  • the operation of the apparatus depicted in Figure 1 involves introducing a fuel and oxygen-containing gas into combustion chamber 3 and combusting a first part of the fuel introduced into the combustion chamber 3 under conditions effecting pulse combustion thus producing a hot gaseous stream comprising a remaining part of the fuel introduced into the combustion chamber 3, the pulse combustion being operable to produce velocity oscillations of at least about 20 Hz and acoustic dynamic pressure levels of at least about 165 dB in the combustion chamber.
  • the hot gaseous stream from the combustion chamber is then discharged into an inlet of an elongated resonance zone bounded by a conduit wall having an inlet at one end therefor and an outlet at the other.
  • the remaining part of the fuel in the hot gaseous stream is combusted in the resonance zone thereby further producing heat and a combustion product stream.
  • Heat is transferred from the combustion product stream through the conduit material surrounding the resonance zone into a bed of solid particles 7 confined in a reaction zone.
  • a fluidizing liquid vapor or gas is injected into and through the reaction zone through a port 8 at a rate operable for maintaining the solid particles in an agitated state.
  • the solid particles in the reaction zone are thus heated by heat transfer from the combustion product stream in the resonance zone, such that the overall rate of heat transfer from the combustion product stream to the solid particles is at least about twice as high as that which would be achieved in the absence of pulse combustion.
  • a reactant material is introduced into the reaction zone through one or more ports 6, mixed with the heated solid particles of the bed and the fluidizing medium, and, thus undergoes endothermic reaction or physical change in the bed and is converted to useful products.
  • the intense acoustic field radiated into the bed of solid particles 7 in the reaction zone from the resonance tubes 5 enhances mixing of the bed and reactant material charged thereto and increases rates of mass transport and reactions in the bed, thereby resulting in high process throughput rates.
  • the reactor of this invention is preferably constructed from a refractory-lined carbon steel but could also be made of a high-temperature alloy capable of withstanding temperatures up to about 1255°K (1800°F), at pressures of up to 1 x 10 6 pa (about 12) atmospheres.
  • the preferred reactor configuration is cylindrical.
  • the reactor diameter or width 22 can vary from less than about 0.3 m (1 foot) to greater than about 3 m (10 feet).
  • the reactor height 23 can vary from less than about 1.5 m (5 feet) to greater than about 15 m (50 feet).
  • the height-to-diameter or width ratio of the reactor is preferably maintained in the range of about 1 to about 10.
  • the reactor operates at pressures ranging from about 100 x 10 3 Pa to 1 x 10 6 Pa (near atmospheric to about 12 atmospheres) and the operating temperature is in the range of about 783 to 1255°K (950° to about 1800°F), depending upon the type of feed material and the desired products.
  • a solid bed material may act as both a heat receiver and catalyst for the desired reaction.
  • the use of a particular type of reactor bed depends upon the reactant material, the process being carried out, and the products desired.
  • Bed material can be an inorganic material, including, e.g., sand, ash or metal salt, or a carbonaceous material, including, e.g., coal, coal char, petroleum coke, biomass, oil shale, spent oil shale, a mixture of inorganic material and carbonaceous material or a mixture of bed material and feed material for conversion, such as biomass, or a feed material slurry such as coal-water slurry or black liquor.
  • the size of the bed material is preferably in the range of about 50 to about 500 ⁇ m.
  • the fluidizing gas e.g., steam is injected into and passes through the bed material at a superficial velocity of about 0.3 to 3.0 m/s (one foot per second to about 10 feet per second).
  • the bed material thus undergoes fluidization, i.e., the particles of the bed material undergo mixing and remain in a continuous state of agitation.
  • Fluidized bed density varies with the velocity and viscosity of the fluidizing gas or medium and size distribution, density and shape of the bed particles.
  • Fluidizing gas may be fed to the reactor by a blower, a compressor or pump, through a gas distribution plate, nozzles or sparge tubes, preferably at a pressure slightly higher than the average reactor pressure in order to compensate for pressure drop caused by the distribution means, bed material, and downstream lines.
  • agitated state as used herein is meant the state solid particles are in when they are in a moving, fluidized, or entrained bed and aerated by a flowing gas, or in a slurry bed.
  • agitated movement as used herein is meant the movement of the solid particles when they are in an agitated state.
  • the fuel can be a liquid, gas, solid, or a mixture thereof.
  • a liquid fuel such as heavy fuel oil, or a gaseous fuel such as natural gas, or a synthetic gas is used; however, a solid fuel, e.g., coal, coal char, biomass or biomass char can also be used.
  • combustion is initiated by a spark or a gas-fired ignitor.
  • reaction products and a portion of the fluidizing gas leave the reactor through a conduit at the top of the reactor. Entrained solid particles of the bed and solid reaction products, if any, may be separated in a cyclone and sent back into the reactor. A portion of the gaseous stream of reaction products and fluidizing gas, now free from entrained particulate matter, is preferably recycled to the reactor for fluidization purposes. If the product gas contains a condensable component, then preferably at least a portion is cooled to condense any readily condensable components, which are then transferred to a product recovery zone.
  • the pulse combustor essentially consists of three components: 1) inlet valves 59 for air, preferably aerodynamic valves rather than mechanical or flapper valves, 2) a combustion chamber 60 having a fuel injector 61, and 3) one or more tailpipe or resonant tubes 62. Fuel and air enter the combustion chamber and an ignition source fires the mixture. The steady increase in volume, caused by the rapid increase in temperature and evolution of combustion products, pressurizes the chamber. As the hot gas expands, the aerodynamic valve acting as a fluidic diode permits preferential flow in the direction of the resonance tube.
  • pulse combustors may be used in the apparatus and method of the present invention, including the Helmholtz, Schmidt, and Rijke tubes.
  • Helmholtz type combustors are preferred for their superior combustion performance and the highly resonant nature of the Helmholtz configuration, which tends to yield the highest pressure fluctuations per Btu/hr of firing in given combustor volume.
  • the resulting high level of flow oscillations improve combustion efficiency and provide, a level of pressure boost useful in overcoming pressure drop in heat exchange and any downstream ash removal subsystems.
  • At least two types of air inlet valves can be used. Although mechanical valves yield somewhat higher boost pressures, the reliability of these valves is generally low, particularly in solid-fueled applications. Combustion of solid fuels is more likely to result in ash deposits which deteriorate valve seatings in mechanical systems. Erosion, corrosion and metal fatigue further limit the application of mechanical valves. Aerodynamic valves, having no moving parts, are therefore preferred for their high reliability and low maintenance.
  • the intrinsic stoichiometry of the pulse combustor can be fixed by design by those of skill in the art given the teachings herein and will remain relatively constant over a wide range of firing rates. At the lower end of this firing range, the combustion-induced pressure fluctuation in the chamber is lower. Therefore, the amount of air intake induced by the fluidic diode (the aerodynamic valve) in response to dynamic pressure fluctuations in the combustion chamber is lower.
  • the amplitude of the pressure fluctuations in the combustion chamber is increased due to the increase in the heat release responsible for excitation of the combustion-induced dynamic pressure. This, in turn, induces more air intake through the aerodynamic valve.
  • the combustor operating stoichiometry is, therefore, automatically maintained over a range of firing without the need to actively control and coordinate the combustion air and fuel mass flow rates.
  • the primary function of the aerodynamic valve is to act as a fluidic diode which employs the pressure fluctuations in the combustion chamber for inducing intake of the combustion air.
  • Two parameters dominate the design of an aerodynamic valve, i.e., the minimum resistance to air intake and the fluidic diodicity of the valve.
  • the latter is a non-dimensional ratio between the resistance to flow out of the chamber and the resistance to flow into the chamber (intake).
  • the higher the fluid diodicity of the aerodynamic valve the more air per Btu/hr of fuel firing is induced by the intake.
  • a combustor that normally operates with high excess air would, by virtue of employing a valve with high minimum resistance to air intake (smaller minimum throat diameter), operate at lower air stoichiometry by throttling the air intake at the inlet. With a fixed damper setting at the inlet, the combustor firing rate can be varied with the induced stoichiometry remaining essentially constant for a range of firing.
  • the turndown ratio could be greater than 8:1. This, however, may require an inlet air fan if the pressure drop downstream in the system requires it. Nevertheless, the air intake (mass flow rate) remains dependent on the firing rate since the self-aspiration and boost pressure contribution of the pulse combustor unit remains in effect. This system configuration tends to increase the maximum combustion intensity achievable for two reasons. First, with the higher flow resistance at both ends of the chamber, more dynamic pressure amplitude is obtained. Second, on air intake, the presence of an air fan tends to allow "supercharging" of the combustor to higher firing rates than are attainable under atmospheric aspirating conditions.
  • Pressure fluctuations generally range from 13.8 x 10 3 to 34.5 x 10 3 Pa 2 to 5 psi)(peak-to-peak). These fluctuations are substantially sinusoidal and at frequencies characteristic of the Helmholtz/Quarter Wave fundamental mode of the combustor. These pressure fluctuation levels are in the order of about 165 to about 190 dB in sound pressure level. Sound intensity, as measured adjacent to the resonant tube wall, is in the range of 140 to 150 dB.
  • the acoustic field frequency range depends primarily on the combustor design and is only limited by the fuel flammability characteristics. Generally, the geometry of the resonance tube (diameter, length, single or multiple tube, etc.) and resonance tube to combustion chamber volume ratios influence the frequency of the acoustic field produced. The frequency of oscillation is given by: Where:
  • the geometry of the combustion chamber can be selected to effect the fraction of the fuel burn which contributes to inducing the pressure oscillations, and the fraction which is burned downstream from the dynamic pressure peak region under the influence of the induced oscillatory flow conditions.
  • the burn rate in the combustion chamber is dominated by vortices which are shed from the transition in the cross-sectional area of the chamber. In the resonance tube, however, the burn rate is dominated by the axial, oscillating flow velocity component which tends to increase monotonically from the resonance tube inlet to the exit.
  • the combustion process in the resonance tube is mostly responsible for completing the burn of char produced from larger particles which are volatilized and partially burned upstream in the chamber.
  • the increase in the oscillating velocity along the resonance tube maintains a high rate of char burn as the char particles become more prone to entrainment and as the O 2 partial pressure decreases.
  • the relative motion between the gases and the solids is dependent on swirl, turbulence, etc., and these flow fields tend to get dampened downstream of the flame, the region in which they are needed most.
  • the fire tubes are the resonance tubes of the pulse combustor
  • only a fraction of the fuel is combusted in the combustion chamber, particularly if low-grade solid fuels are employed, thus the temperature of the products of combustion at the inlet to the resonance tube is generally lower, as shown in Figure 2.
  • This allows the use of less expensive materials for the resonance tube as compared to the material required to tolerate higher flue gas inlet temperatures in the case of conventional fire tubes.
  • the rate of temperature drop of the flue gas along the resonance tube is also lower than for the case of a conventional fire tube, as shown in Figure 2. This is due to the continued combustion and hence the heat release in the tube section near the inlet. This does not compromise the ultimate fuel conversion efficiency in the pulse combustor due to the vigorous mixing promoted by combustion-induced flow oscillations found in the resonance tubes of pulsating combustors which completes the combustion within the tubes.
  • the slow decrease of the flue gas temperature in this region depicted as continued heat release in Figure 2 provides for high heat flux and heat transfer in the region with net gain over conventional fire-tube systems, due to the generally higher log mean temperature difference between the flue gas temperature and the reactor temperature in this region and the predominantly higher radiative heat transfer component present therein.
  • the flue gas flow in the resonance tube has two velocity components, one being the mean flow velocity and the other being an oscillatory component which monotonically increases in amplitude from the resonance tube inlet to the exit.
  • the mean velocity of the flue gas in the resonance tube of the pulse combustors employed in this invention are generally higher than those found in a conventional fire tube. This is primarily due to the combustion induced pressure boost which develops in the combustion chamber of these pulse combustors. This pressure boost, a mean pressure gain, is developed as a result of the oscillating pressure in the combustion chamber of a pulse combustor and the fluidic diodicity of the aerodynamic valve.
  • the boost pressure in the chamber can develop flue gas velocities in the order of at least 305 ms -1 (1000 ft/sec) without the need for forced combustion air or induced draft fans.
  • the higher mean flow velocity in the resonance tube gives rise to higher film velocities and hence higher heat transfer coefficients between the flue gas and the inner wall of the resonant tubes.
  • the oscillating flow velocity component which monotonically increases in amplitude from the resonance tube inlet to the exit, further improves the convective heat transfer between the flue gas and the inner wall of the resonance tube.
  • the heat transfer coefficient increases due to the monotonically increasing amplitude of the oscillatory flow velocity component. This enhances the heat flux in this region with flue gas exit temperatures being lower than those obtained with conventional fire tubes of the same size.
  • the lower flue gas temperature of the flue exiting the resonance tubes improves the system's thermal efficiency since more heat is extracted from the flue gas and transferred to the reactor bed to support the endothermic reactions occurring in the bed.
  • the design of the resonance tube could involve complex generators in principle, but this is not necessary, i.e., a straight-line generator forming a tubular or a conical section is quite practical. This degree of freedom allows control of the gas exit velocity and the overall volume of the resonance tube for a given length.
  • the volume of the resonance tube affects both the residence time available for completing the burn of char produced from larger particles as well as the resonant frequency of the unit.
  • radiant heat transfer continues over a longer length of the fire tube when using solid fuels because the burning fuel particles continue to provide high luminosity foci as they flow and burn in the resonance tube.
  • the heat transfer tubes there are various configurations suitable for the heat transfer tubes according to the present invention, including a single straight tube, multi-tubes, U-tube(s), coiled tubes, and shrouded or shielded tubes.
  • the size, shape and number of the resonance tubes depends upon the heat transfer profile required and the reactor size.
  • the products of combustion are discharged through two separate resonance tubes immersed within the reactor. After heat exchange from the tubes to the bed material, the flue gas streams combine in a plenum or manifold just outside the reactor.
  • the in-bed heat transfer surface comprises parallel resonance tubes 5 having inlets in communication with combustion chamber 3 and outlets in communication with common plenum 10.
  • the resonance zone comprises a single or multiple tube 13 having a U-shaped bend near the top of the fluid bed 14 and wherein the inlet 15 and outlet 16 of the resonance tubes are near the bottom 17 of the reactor 18.
  • the combustion chamber 19 is in communication with the inlet of the resonance tubes 15 and an exhaust plenum 20 is provided in communication with the exit 16 of the resonance tubes.
  • Such U-shaped resonant tubes are advantageous in alleviating problems caused by thermal expansion and stress, which can result in separation of tube couplings.
  • the combustion gases pass upward through a bundle of resonance tubes having three sections.
  • the combustion gases first pass through a straight tubular bundle section, then a coiled tubular bundle section and finally through a second straight tubular section before being discharged.
  • the coiled tubular bundle of this arrangement provides a very large heat transfer surface and is thus preferable in high temperature applications.
  • a portion of the resonant tube may be surrounded by cylindrical shield.
  • the shielded section may vary in length, depending upon the nature of the bed and the feed material to be processed which may require that the temperature of the metal in contact with the bed be maintained below a given temperature, e.g., to avoid formation of smelt.
  • a relatively stagnant film of gas remains confined in the annular space between the resonant tube and shield, thereby maintaining the outer surface of the shield below the desired temperature. In the case of black liquor recovery this temperature is below about 1005°K (1350°F).
  • the annular space may cause the average outside surface temperature of the shield to be from about 422 to 478°K (300 to 400°F) lower than the average outside surface temperature of the shielded region of the resonance tube.
  • the shield is useful in preventing undesirable physical or chemical changes in bed or feed materials resulting from the relatively high outside tube surface temperatures near the inlet of the tubes.
  • a most preferred embodiment of this invention is the application of the invention to all types of black liquor recovery, particularly in Kraft black liquor recovery and sulfite black liquor recovery.
  • the description provided herein employs the case of Kraft black liquor recovery as an example since that process spans more comprehensively the relevant process variables.
  • the preferred embodiment of the black liquor reactor 21 is provided in Figure 5. Near the top of the reactor, a product gas and entrained product chemicals exit 24 is provided from the reactor's freeboard zone of the fluid bed. Immersed in the fluid bed are the tubes 25 of a number of modular pulse combustor units 26 rated each at about 440 to 1465 kw (1.5 to 5 MMBtu/hr) of firing rate, depending on the size of the reactor and its throughput.
  • the preferred capacities for such reactors are 0.25, 0.5, 0.76, 1.51 and 2.52 kgs -1 (1, 2, 3, 6 and 10 tons/hr) of black liquor solids processing.
  • the preferred size of a reactor for processing 1.5 kgs -1 (six tons per hour) of black liquor at near atmospheric pressure in the reactor is about 2.44 m (8 feet) wide, 1.5 m (5 feet) deep, and 5.4 m (18 feet) high.
  • the preferred multiple resonance tube pulse combustor operation is tandem with aerodynamic valve coupling of each tandem unit 27 for out-of-phase operation, thus reducing the noise to the outside and enhancing pressure oscillations in the pulsating combustors.
  • the reactor is also provided with means 28 for spraying the liquor directly onto the fluidized bed material.
  • the preferred fluid bed material for this embodiment is sodium carbonate (soda ash), having a particle size distribution of about 150 ⁇ m to about 600 ⁇ m, with a preferred mean size of about 250 ⁇ m.
  • the reactor also is provided with steam and recirculated product gas injection means 29 to distribute the steam and recirculated gas to fluidize the bed.
  • the preferred steam temperature entering the bed is about 867°K to 922°K (1100 to 1200°F) and the preferred fluidization velocity is about 0.61 ms -1 to 1.2 ms -1 (2 to 4 ft/sec).
  • the gasifier is represented by reactor 31.
  • black liquor is injected into a fluidized bed which is fluidized with steam and a recirculated portion of the product gas.
  • the black liquor feed is preferably injected into the bed through a steam-atomized spray nozzle.
  • the feed pump may consist of a progressive cavity pump or, more advantageously, a positive displacement gear pump.
  • the black liquor is preferably maintained at approximately 355°K (180°F) in the storage vessel.
  • the feed line to the injector should be insulated and preferably includes steam tracing. Feed injection may be facilitated through the use of sufficient feed line steam tracing, ample purging of the injector tip prior to switch over to black liquor, and use of a simple gear pump.
  • the bed solids consist of sodium carbonate, the residual salt formed upon black liquor gasification.
  • Bed charge may consist of a variety of commercial sodium carbonates. Products differing in mean particle size may be combined to provide the desired fluidization properties.
  • black liquor should be fed into the bed starting at a temperature of about 922°K (1200°F) and, preferably, about 811°K (1000°F). At this temperature, the carbon deposition rate is higher than the gasification rate. Soda ash bed material should have a residual layer of carbon in order to prevent bed agglomeration. Where the starting soda ash contains an excessively low carbon level, the entire carbon layer may be gasified by the fluidizing steam before the bed reaches the desired starting temperature. When the carbon layer disappears due to gasification, soda ash may fuse together as a result of impurities, e.g., NaCl and KCl. A carbon layer on the soda ash granules can be maintained to prevent such ash fusion. Char gasification on the sodium carbonate solids is preferably controlled by feed rate and temperature such that the bed establishes an equilibrium carbon level of between about 0.5 to 10 percent.
  • the reactor temperature is preferably maintained in the range of 894°K to 977°K (1150°F to 1300°F) to ensure that smelt formation does not occur.
  • the product chemicals can then be easily and safely discharged from the bed in a solid state.
  • Lower operational temperature reduces steam heat losses, improves thermal efficiency and reduces the cost of reactor materials of construction. Nevertheless, operating the bed at temperatures above 894°K (1150°F) allows economic throughputs with minimum carbon rejection.
  • the fire-tube wall temperature be maintained below the temperature at which the bed material softens 1005°K (1350°F) in order to prevent bed agglomeration.
  • the bed temperature is monitored at several locations, as is the fire-tube wall.
  • the bed is preferably operated at near atmospheric pressure with superficial fluidization velocity of approximately 1 ms -1 (3 ft/sec). Initial fluidization may be accomplished by injecting nitrogen gas, the steam being introduced after the bed attains a uniform start-up temperature.
  • the lower limit superficial velocity is approximately 0.03 ms -1 (0.1 ft/sec). Fluidization and bed temperature become stratified over the length of the reactor at or below such velocity. Under normal operating conditions, the temperature of the bed is uniform throughout.
  • Heat is supplied to the fluid bed 31 by resonance tubes 32 connected directly to the pulse combustor chamber.
  • the flue gases from the combustor which exit the reactor at about 977°K to 1033°K (1300°F to 1400°F), are sent to a water or fire tube boiler 33 for heat recovery.
  • the product gas may also be combusted in such boilers to provide a single means for steam generation.
  • the preferred in-bed heaters for this embodiment are the resonance tubes of a pulsating combustor, as described earlier; however, this is not essential since properly shielded and controlled electric heaters, for example, are technically feasible for heating the bed and could be economically feasible in parts of the world where the cost of electricity is unusually low, for example, where hydropower generators are found.
  • Another example of a bed heater is the use of superheated steam flowing through heat exchanged tubes immersed in the fluid bed. In the case of both the electric heater and the steam tube heater examples described above, there is no radiation of an intense acoustic field from the heater tubes to the reaction zone, which is beneficial to the rate of reaction and bed fluidization.
  • the preferred gasification reactor configuration takes the form of a rectangular fluidized bed with sidewall-mounted pulse combustors located at several elevations and connected to horizontally mounted resonance tubes. This configuration simplifies manifolding of fluidizing steam, and allows easy maintenance of the combustors.
  • a typical combustor consists of two coupled pulse combustors operating out of phase for noise reduction. The dual module would have a nominal firing capacity of about 732.7 Kw (2.5 MMBtu/hr). Three such modules would be required for a one ton per hour (black liquor solids) unit, such as depicted in Figure 5.
  • a radiation shield is preferably affixed adjacent the position of the tubes closest to the combustion chamber to reduce tube-wall temperature in contact with bed solids, and prevent their softening from contact with a high temperature bare-metal tube.
  • the product gas exits the gasifier and enters cyclone 30 where entrained fine particulates are separated from the gas stream. A portion of the product gas is recycled to the fluidized bed through ejector 34.
  • the motive fluid for the ejector is steam, which may be internally generated within a waste heat boiler 35.
  • the balance of the product gas is cooled in a kettle type steam generator 35 and is exported for power generation or process use.
  • the product gas heating value varies from about 894 - 1490 x 10 4 J/m 3 (240 - 400 Btu/scf and contains as much as 65 volume percent hydrogen, thus having an energy density several times that achievable with autothermal systems.
  • the cyclone fines elutriated from the bed only account for a small fraction of the feed carbon.
  • This carbon is easily recovered upon dissolution of the recovered sodium carbonate solids.
  • This carbon may be reinjected into the bed and consumed in the pulse combustor to provide endothermic heat for the reactor, or it may be utilized elsewhere in the mill. If reinjected, it is beneficial to premix with fresh black liquor to promote sticking of the residue to bed solids and reduce premature elutriation from the bed.
  • Solids discharge systems for fluid-bed applications are available with proven and safe performance records.
  • the reactor is furnished with a screw-type solids withdraw valve 37 and solids are collected at regular intervals to measure carbon content as a function of throughput in order to monitor specific gasification rates.
  • the bed sulfur and sulfate levels diminish or remain constant. Sulfide content is negligible in the bed.
  • the inorganic salts contained in the bed solids draw-off 37 and cyclone materials are comprised primarily of sodium carbonate and also include sodium sulfide, sodium sulfate, sodium chloride, and residual carbon in smaller quantities. These materials are dissolved in a dissolution tank 36 to recover the inorganic salts for recycling to the paper plant. In addition, the carbon value is recovered, e.g., in an agitating dissolving tank 36 followed by a disk filter (not shown) for carbon recovery. Water may easily penetrate the porous carbon shell in order to effectively dissolve contained salts. Thus, dissolving efficiency is about 97.7-99.9 percent.
  • the bulk of the black liquor feed sulfur content is advantageously emitted in the form of hydrogen sulfide.
  • These species can be easily recovered to form green liquor through a simple scrubbing operation.
  • the cooled process gas generally enters a scrubbing column where the recirculating scrubbing liquid consists of alkaline sodium carbonate formed in the dissolving tank 36.
  • the process gas is scrubbed to form green liquor.
  • the cleaned, desulfurized product gas generated from the scrubber may be utilized as a fuel source for a boiler, gas turbine or other unit.
  • the green liquor may then be sent to the conventional mill causticizing loop, where lime is added to precipitate carbonate and, thus, form sodium hydroxide and sodium sulfide.
  • the primary sulfur reactions believed to occur in the gasifier include the following: Lignin ⁇ Organic Sulfides + H 2 S Organic Sulfides + H 2 O ⁇ CO, CO 2 , H 2 + H 2 Na 2 S + H 2 O + CO 2 ⁇ Na 2 CO 3 + H 2 S Na 2 SO 4 + 4CO ⁇ Na 2 S + 4CO 2 H 2 O + CO ⁇ CO 2 + H 2
  • Reactions (1) and (2) represent thermal and steam gasification steps leading to the production of low molecular weight gas species and hydrogen sulfide. Due to the catalytic nature of the inorganic salts, the steam gasification reactions diminish organic sulfide species to very low levels.
  • Reaction (3) depicts the carbonation of sodium sulfide in the presence of steam and carbon dioxide.
  • Reaction (4) represents the reduction of sodium sulfate to sodium sulfide via the reaction with carbon monoxide.
  • Reaction (5) represents the water-gas shift equilibrium which primarily effects the relative ratio of carbon monoxide to carbon dioxide. Neither sodium sulfate nor sodium sulfide is stable in the gasifier environment. The net reaction for sulfate is, therefore: Na 2 SO 4 + 4CO + H 2 O ⁇ Na 2 CO 3 + 3CO 2 + H 2 S The hydrogen sulfide is then absorbed in an aqueous phase to regenerate sodium sulfide.
  • the sodium carbonate solution generated by dissolution of the bed solids provides an ideal solution for scrubbing the product gas. Since the sodium carbonate solution so formed is slightly basic, the acidic hydrogen sulfide species is absorbed as sodium bisulfide. This green liquor is then returned to the conventional causticizing loop.
  • the system of this invention is therefore capable of generating sodium sulfide at a very high conversion efficiency.
  • Table 1 depicts a material balance for a one ton per hour (black liquor solids) capacity unit based on the flow diagram. Eighty percent of the total sulfur is assumed to be stripped to hydrogen sulfide in the product gas and 70 percent of the sulfur content in the black liquor feed is reduced. The hydrogen sulfide is quantitatively absorbed in the scrubber. The carbon rejected with the product solids is 5 percent and recovered for reinjection into the gasifier.
  • Table 3 depicts a mass and energy balance summary for the 0.25 kgs -1 (one ton per hour) unit.
  • the balance is based on the production of fuel gas combusted in an auxiliary boiler.
  • the fuel gas export accounts for about 2189.6 kw (7.473 MMBtu/hr) or about 72 percent of the net energy output.
  • Export steam production accounts for 710.2 kw (2.424 MMBtu/hr) or 23 percent of the energy output.
  • Recoverable carbon accounts for the balance of the energy output. Based on the total energy output relative to the black liquor feed input, the net system thermal efficiency is about 78.7 percent. If only steam export is desired, it may be accomplished by combusting the export fuel in the flue gas waste heat recovery system.
  • the net thermal efficiency for the steam export only case is about 67 percent, which efficiency exceeds, or is competitive with, the efficiency achievable in large-scale Tomlinson recovery boilers, despite the small size of the black liquor gasification and recovery system of the present invention.
  • the present system can be constructed in modular units with capacities in range of 0.25 - 2.5 k/s (one to ten tons per hour). These units can be skid mounted, truck or rail transportable and require a minimum level of field erection. Thus, a particularly advantageous application of black liquor gasification and recovery system of invention arises in incremental capacity addition to Kraft or sulfite pulping processes.
  • Sodium carbonate was fluidized by a mixture of steam and flue gas from a boiler and heated by heat transfer from a resonance tube under the following conditions: Initial Temperature of Sodium Carbonate 299°K (26°C) Size of Sodium Carbonate 100-1000 microns Fluidizing Velocity of Mixture of Steam and Flue Gas 1ms -1 (3 ft./sec.) Temperature of Fluidizing Gas 473°K (200°C) Fuel Fed to Pulse Combustor Natural Gas Temperature Inside Pulse Combustor 1643°K-1920°K (2500-3000°F) Temperature Inside Resonance Tube 1365°K-1920°K (2000-3000°F)
  • the temperature of the fluidized bed was maintained at 922° (1200°F).
  • black liquor was injected into the fluidized bed of sodium carbonate.
  • the black liquor undervent pyrolysis and gasification, yielding solid, liquid and gaseous products.
  • the solid product was deposited on the fluidized sodium carbonate and was withdrawn from the reactor.
  • the vaporized liquid and gaseous products were discharged from the reactor and were then cooled to separate condensed liquid products from the gas. The following results were obtained.

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  • Processing Of Solid Wastes (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Fluidized-Bed Combustion And Resonant Combustion (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Hydrogen, Water And Hydrids (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
  • Coloring Foods And Improving Nutritive Qualities (AREA)

Claims (13)

  1. Procédé de récupération de l'énergie et des substances chimiques de valeur d'une liqueur usée ou noire sans produire de fusion, ledit procédé comprenant les étapes consistant :
    (a) à former un lit de sels de sodium solides dans un réacteur ;
    (b) à injecter de la vapeur dans ledit lit afin de maintenir le lit dans un état agité ;
    (c) à chauffer indirectement ledit lit à une temperature à peu près uniforme dans la plage de 510 °C à 732 °C (950 °F à 1350 °F) par transfert de chaleur à partir de tubes immergés dans ledit lit ;
    (d) à pulvériser la liqueur directement sur la matière chaude du lit ;
    (e) à faire réagir ladite liqueur avec ladite vapeur en l'absence d'air ou d'oxygène de traitement dans ledit lit afin de former un produit gazeux contenant du sulfure d'hydrogène et sans produire de fusion ;
    (f) à retirer ledit produit gazeux dudit réacteur ; et
    (g) à épurer le sulfure d'hydrogène issu dudit produit gazeux pour former une liqueur verte et un produit gazeux vert.
  2. Procédé selon la revendication 1, dans lequel lesdits tubes comprennent un ou plusieurs tubes d'un ou plusieurs dispositifs de combustion à pulsation.
  3. Procédé selon la revendication 1, dans lequel lesdits tubes comprennent un ou plusieurs réchauffeurs de tubes à vapeur d'eau.
  4. Procédé selon la revendication 1, dans lequel lesdits tubes comprennent un ou plusieurs réchauffeurs électriques.
  5. Procédé selon la revendication 1, dans lequel ledit produit gazeux est ensuite traité pour obtenir un produit gazeux propre et récupérer les substances chimiques de traitement de ladite liqueur.
  6. Procédé selon la revendication 5, dans lequel ledit traitement dudit gaz produit comprend une épuration dudit produit gazeux pour récupérer le soufre et former une liqueur verte.
  7. Procédé selon la revendication 6, comprenant en outre l'étape d'addition de chaux dans ladite liqueur verte pour former de l'hydroxyde de sodium et du sulfure de sodium.
  8. Procédé selon la revendication 1, dans lequel lesdits sels de sodium solides comprennent du carbonate de sodium.
  9. Procédé selon la revendication 1, dans lequel ledit lit de solides présent dans ledit réacteur, est chauffé à une température de 894 °K à 1005 °K (1150 °F à 1350 °F).
  10. Procédé selon la revendication 1, dans lequel une partie dudit produit gazeux qui est retiré dudit réacteur, est injectée dans le lit avec la vapeur d'eau.
  11. Procédé selon la revendication 1, comprenant en outre les étapes de retrait d'une partie desdits sels de sodium solides à partir dudit lit de solides ; de dissolution desdits sels de sodium solides pour récupérer des sels inorganiques et du carbone de valeur, et former une solution de carbonate de sodium ; et d'utilisation de ladite solution de carbonate de sodium pour épurer ledit gaz produit.
  12. Procédé selon la revendication 1, dans lequel ladite liqueur comprend la liqueur issue d'un procédé de production de pâte kraft.
  13. Procédé selon la revendication 1,dans lequel ladite liqueur comprend la liqueur issue d'un procédé de production de pâte au sulfite.
EP19930102400 1989-02-14 1990-02-14 Procédé pour la gaséification indirecte de liqueurs résiduelles ou noires Expired - Lifetime EP0550401B1 (fr)

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US310202 1989-02-14
US07/310,202 US5059404A (en) 1989-02-14 1989-02-14 Indirectly heated thermochemical reactor apparatus and processes
EP19900301554 EP0383565B1 (fr) 1989-02-14 1990-02-14 Procédés et appareil pour réactions endothermiques

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DE69033536T2 (de) 2000-08-24
NO178100B (no) 1995-10-16
GR3034017T3 (en) 2000-11-30
US5059404A (en) 1991-10-22
DE69008572T2 (de) 1994-10-06
ES2053098T3 (es) 1994-07-16
ATE105327T1 (de) 1994-05-15
CA1339018C (fr) 1997-03-25
UA26901C2 (uk) 1999-12-29
US5637192A (en) 1997-06-10
NO178100C (no) 1996-01-24
EP0383565A1 (fr) 1990-08-22
FI94462B (fi) 1995-05-31
EP0550401A1 (fr) 1993-07-07
DK0383565T3 (da) 1994-09-19
NO900693L (no) 1990-08-15
ES2148186T3 (es) 2000-10-16
FI94462C (fi) 1995-09-11
US6149765A (en) 2000-11-21
DE69008572D1 (de) 1994-06-09
NO900693D0 (no) 1990-02-13
EP0383565B1 (fr) 1994-05-04
RU2073064C1 (ru) 1997-02-10
DE69033536D1 (de) 2000-06-08
LTIP1115A (en) 1995-04-25
BR9000675A (pt) 1991-01-15
US5306481A (en) 1994-04-26
JPH0314688A (ja) 1991-01-23
ATE192480T1 (de) 2000-05-15
DK0550401T3 (da) 2000-08-07
FI900698A0 (fi) 1990-02-13

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